How do you utilize a big man who refuses to rebound and is absolutely clueless on D?

i don't know TO. i'm not a coach nor do i know the game well enough. i did suggest the idea of him being a good 6th man, but i aslo mentioned how the rest of the team's overall shittyness kind of prevents that from happening. Toronto sucks bad, but don't tell me Andrea makes our roster worse. That's more a result of dudes like Dorsey, Ajinca, Weems, Bayless, Wright, etc.